lib 1003724

import org.apache.commons.io.input.ReversedLinesFileReader;

static LS lastNLines(File f, int n) ctex {
  if (f == null) ret emptyList();
  
  try {
    ReversedLinesFileReader r = new(f);
    try {
      new LS l;
      while(l(l) < n) {
        S s = r.readLine();
        if (s == null) break;
        l.add(s);
      }
      ret reversedList(l);
    } finally {
      r.close();
    }
  } catch (FileNotFoundException e) {
    ret emptyList();
  }
}

static L<S> lastNLines(int n, File f) {
  ret lastNLines(f, n);
}